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Analog Devices Inc. LTC3887EUJ-2#PBF
- Part No.:
- LTC3887EUJ-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887EUJ-2#PBF.pdf
- Description:
- DUAL OUTPUT POLYPHASE STEP-DOWN
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
LTC3887EUJ-2#PBF from Analog Devices is a dual-channel, current-mode synchronous step-down DC/DC controller with digital power system management (PSM) via PMBus/I²C/SMBus interface. It supports 0.5 V to 5.5 V output voltage per channel, 4.5 V to 24 V input range, ±0.5% VOUT accuracy, and real-time telemetry of voltage, current, temperature, and faults. It is used in high-density server and telecom POL supplies requiring autonomous sequencing and black-box fault logging.
For engineers reviewing the LTC3887EUJ-2#PBF datasheet, LTC3887EUJ-2#PBF pinout, LTC3887EUJ-2#PBF application, or LTC3887EUJ-2#PBF equivalent, key selection criteria include dual-channel PMBus-configurable control, inferred input current sensing, DCR-based inductor current monitoring, three-state PWM support for phase shedding, and EEPROM-stored configuration for field-deployable reproducibility.
Technical Context
The LTC3887EUJ-2#PBF implements a dual-phase, current-mode PWM architecture with independent loop control per channel. It integrates a 12-bit ADC for telemetry, supports fast analog feedback loops with digital supervision, and uses inferred input current sensing rather than dedicated sense resistors.
It features autonomous operation without host firmware-EEPROM stores startup configuration, fault thresholds, sequencing delays, and margining settings. The device supports cascaded multi-rail coordination via PMBus broadcast commands and includes direct ΔVBE and external thermistor temperature sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 24 V - Supports standard intermediate bus rails including 5 V, 12 V, and 19 V inputs without external level shifting. |
| VOUT Range | 0.5 V to 5.5 V per channel - Covers core, I/O, and auxiliary rail requirements for FPGAs, ASICs, and processors. |
| VOUT Accuracy | ±0.5% over line/load/temp - Enables tight regulation for sensitive digital loads without external calibration. |
| Max Output Current | 30 A per phase - Scales with external MOSFET selection; supports high-current POL designs using discrete power stages. |
| Temperature Sensing | ΔVBE and external thermistor - Provides dual-path thermal monitoring for junction and board-level temperature tracking. |
| Digital Interface | PMBus v1.3 / SMBus / I²C - Enables standardized telemetry readback, configuration write, and fault logging across heterogeneous power systems. |
| EEPROM Capacity | On-chip nonvolatile memory - Stores full configuration including sequencing order, OV/UV thresholds, and black-box fault logs for post-failure analysis. |
Pinout & Package
The LTC3887EUJ-2#PBF is housed in a 6 mm × 6 mm, 40-pin QFN package with exposed thermal pad (EUJ suffix), optimized for high-power density and thermal performance in multilayer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1, PGOOD2 | Open-drain power-good status outputs | Assert low when corresponding VOUT is within ±7.5% of programmed value; used for inter-rail sequencing and system enable logic. |
| CLKIN, CLKOUT | Phase synchronization inputs/outputs | Enable interleaved operation across multiple controllers to reduce input ripple and improve thermal distribution. |
| SCL, SDA | PMBus/I²C bidirectional serial interface | Connect to system management bus for configuration, telemetry readback, and fault reporting without host CPU intervention. |
| ITH1, ITH2 | Loop compensation pins per channel | Accept RC network to set bandwidth and phase margin; supports analog loop tuning while retaining digital supervision. |
| SENSE+ / SENSE− | Inductor DCR current sense inputs | Interface directly to differential voltage across external DCR sense resistor or integrated inductor DCR network. |
| TRK/SS | Tracking and soft-start control | Configures monotonic startup and voltage tracking between rails; supports both master-slave and independent ramp profiles. |
Key Features
| Feature | Design Value |
|---|---|
| Three-State PWM Control | Enables seamless phase shedding during light load to maintain high efficiency without mode transitions or audible noise. |
| Inferred Input Current Sensing | Eliminates need for dedicated input current sense resistor, reducing BOM count and layout complexity while preserving accuracy. |
| Autonomous Sequencing with EEPROM | Stores complete power-up/down timing, delay, and dependency rules-no host software required for repeatable boot behavior. |
| Black-Box Fault Logging | Records timestamped fault events (OV, UV, OC, OT) with pre-fault telemetry snapshots for root-cause analysis in deployed systems. |
| DCR Temperature Compensation | Compensates current sense gain drift due to copper temperature coefficient, maintaining ±3% current measurement accuracy over −40°C to +125°C. |
Applications
| High-Density Server POL | Telecom Line Card Power |
|---|---|
|
Use Scenario: Dual-rail FPGA core and I/O supply on space-constrained 1U server blades with strict thermal and sequencing requirements. IC Role / Device Role / Timing Role: Dual-channel digital controller managing independent 0.85 V/60 A and 1.2 V/40 A rails with synchronized startup and fault-isolated shutdown. Use Value: ±0.5% VOUT accuracy and EEPROM-stored sequencing eliminate manual calibration and ensure consistent boot across thousands of units. |
Use Scenario: Distributed power architecture in carrier-grade Ethernet switches requiring hot-swap capable 3.3 V and 12 V auxiliary rails. IC Role / Device Role / Timing Role: PMBus-managed controller providing real-time telemetry, programmable UV lockout, and graceful power-down during card insertion/removal. Use Value: Black-box fault logging captures transient overcurrent events during hot-swap, enabling predictive maintenance and field failure diagnostics. |
| Industrial PLC CPU Board | AI Accelerator Module |
|
Use Scenario: Ruggedized programmable logic controller with isolated microcontroller, FPGA, and analog I/O requiring stable, monitored 1.8 V and 5 V rails. IC Role / Device Role / Timing Role: Digital power manager supervising rail health, logging temperature excursions, and triggering controlled reset upon thermal violation. Use Value: Direct ΔVBE + thermistor temperature sensing enables accurate junction and ambient monitoring-critical for fanless industrial enclosures. |
Use Scenario: PCIe-based AI inference card with GPU and HBM memory demanding tightly coupled 0.75 V core and 1.2 V memory rails. IC Role / Device Role / Timing Role: Dual-channel controller supporting three-state PWM for dynamic phase shedding and precise voltage margining during validation sweeps. Use Value: Programmable ramp rates and margining offsets allow automated validation of voltage tolerance margins without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3882IUJ#PBF | Same 6×6 QFN-40 package, but uses voltage-mode control and lacks three-state PWM; no DCR temperature compensation. | Lower complexity systems where phase shedding is not required and fixed-frequency operation suffices. | Select LTC3882IUJ#PBF when cost-sensitive designs prioritize simplicity over adaptive efficiency modes. |
| LTC3887IUJ#PBF | Pin-compatible variant with identical specs except default EEPROM configuration-LTC3887IUJ#PBF ships unprogrammed, while LTC3887EUJ-2#PBF ships with factory-loaded EUJ-2 configuration. | Prototyping vs. production deployment: EUJ-2 enables immediate use; IUJ requires LTpowerPlay programming before first power-on. | Choose LTC3887EUJ-2#PBF for production-ready systems needing guaranteed initial configuration; select IUJ for flexible development-stage evaluation. |
Compared with LTC3882IUJ#PBF, the LTC3887EUJ-2#PBF delivers superior light-load efficiency via three-state PWM and enhanced thermal accuracy through DCR compensation; versus LTC3887IUJ#PBF, it eliminates configuration overhead by shipping with validated EUJ-2 register settings for rapid integration.
Availability
LTC3887EUJ-2#PBF is available at Aetrix Electronics and suitable for high-density server POL, telecom line card power, industrial PLC CPU boards, and AI accelerator modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887EUJ-2#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3887EUJ-2#PBF belongs to Analog Devices' Digital Power System Management (PSM) product line, designed specifically for intelligent, self-monitoring point-of-load power supplies in datacenter, networking, and embedded computing applications.
FAQ
What is the primary function of the LTC3887EUJ-2#PBF in a power system?
The LTC3887EUJ-2#PBF serves as a dual-channel, digitally managed synchronous step-down DC/DC controller. It regulates two independent output voltages while providing real-time telemetry, configurable sequencing, fault logging, and PMBus-based system-level control. Its design enables autonomous operation without host firmware, making it ideal for mission-critical infrastructure where reliability and reproducibility are essential. The LTC3887EUJ-2#PBF integrates both analog control loops and digital supervision in a single IC.
Does the LTC3887EUJ-2#PBF require external components for current sensing?
Yes-the LTC3887EUJ-2#PBF supports DCR-based current sensing using external sense resistors or integrated inductor DCR networks, with dedicated SENSE+/SENSE− inputs and built-in temperature compensation. It does not require a separate input current sense resistor due to its inferred input current sensing architecture, reducing component count and board area. The LTC3887EUJ-2#PBF also accepts external thermistors for enhanced thermal monitoring accuracy.
How does the EEPROM in the LTC3887EUJ-2#PBF improve system reliability?
The on-chip EEPROM in the LTC3887EUJ-2#PBF stores all configuration registers-including VOUT setpoints, sequencing delays, fault thresholds, and telemetry scaling factors-enabling consistent, repeatable power-up behavior across units and field updates. This eliminates dependency on host initialization code and ensures deterministic operation even after power loss. The LTC3887EUJ-2#PBF's black-box fault logging further enhances reliability by capturing pre-fault telemetry for root-cause analysis.
Can the LTC3887EUJ-2#PBF be used without the LTpowerPlay GUI?
Yes-the LTC3887EUJ-2#PBF operates autonomously using its factory-programmed EEPROM configuration and requires no host software for basic functionality. LTpowerPlay is optional and used only for development, customization, or field reconfiguration. Once configured, the LTC3887EUJ-2#PBF retains settings across power cycles. For production deployment, the LTC3887EUJ-2#PBF delivers immediate usability without toolchain dependencies.
What thermal sensing methods does the LTC3887EUJ-2#PBF support?
The LTC3887EUJ-2#PBF supports dual-path thermal sensing: internal ΔVBE sensing for MOSFET junction temperature and external thermistor input for board-level or ambient temperature monitoring. It also compensates DCR current sense gain based on measured temperature, ensuring ±3% current accuracy over −40°C to +125°C. This comprehensive thermal awareness makes the LTC3887EUJ-2#PBF suitable for fanless and thermally constrained applications.
LTC3887EUJ-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 34V
- Frequency - Switching:
- 250kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus
- Control Features:
- Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3887EUJ-2#PBF FAQ
1.How can I place an order for LTC3887EUJ-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887EUJ-2#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3887EUJ-2#PBF reliable?
The price and inventory of LTC3887EUJ-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887EUJ-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3887EUJ-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887EUJ-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887EUJ-2#PBF?
LTC3887EUJ-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887EUJ-2#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3887EUJ-2#PBF?
For technical support, including LTC3887EUJ-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887EUJ-2#PBF requirements.
6.How does Aetrix verify that LTC3887EUJ-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3887EUJ-2#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3887EUJ-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3887EUJ-2#PBF?
All LTC3887EUJ-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887EUJ-2#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3887EUJ-2#PBF part is unused and in its original packaging.
Return procedure for LTC3887EUJ-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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